Update a column for a subset of data

Hi all,
I hope you can help me with some suggestions in how to solve the issue i have for the table below
SQL> select * from table1;
NAME                         ID CONCAT               SAME_GR
A                            10 100|200|300
B                            11 100|200|300
C                            12 100|200
D                            10 100|200|300
SQL> What i need to do is to flag the rows which have the same ID & Concat value by updating the same_gr column with the same value, something like
SQL> select * from table1;
NAME                         ID CONCAT               SAME_GR
A                            10 100|200|300              GR1
B                            11 100|200|300              GR2
C                            12 100|200                   GR3
D                            10 100|200|300             GR1
SQL> One important note is that the value in SAME_GR column should have the form of GR<sequence>
I've been trying to use lag/lead functions but i can't succeed in updating the column with the same value for each group of rows where ID & CONCAT are the same.
I forgot to mention i'm on 11gR1.
Any help is very much appreciated.
Cheers,
Dani
Edited by: DanyC on Jun 18, 2010 10:40 AM

yes, you can.. all you need to do add is sum operation. after dense_Rank column sepecify + 254 and thus it will add up the value with dense rank output.
sample run...
PRAZY@11gR2> select ename,dense_rank() over (partition by deptno order by empno) from emp;
ENAME      DENSE_RANK()OVER(PARTITIONBYDEPTNOORDERBYEMPNO)
CLARK                                                    1
KING                                                     2
MILLER                                                   3
SMITH                                                    1
JONES                                                    2
SCOTT                                                    3
ADAMS                                                    4
FORD                                                     5
ALLEN                                                    1
WARD                                                     2
MARTIN                                                   3
BLAKE                                                    4
TURNER                                                   5
JAMES                                                    6
14 rows selected.
Elapsed: 00:00:00.13
PRAZY@11gR2> select ename,dense_rank() over (partition by deptno order by empno)+300 from emp;
ENAME      DENSE_RANK()OVER(PARTITIONBYDEPTNOORDERBYEMPNO)+300
CLARK                                                      301
KING                                                       302
MILLER                                                     303
SMITH                                                      301
JONES                                                      302
SCOTT                                                      303
ADAMS                                                      304
FORD                                                       305
ALLEN                                                      301
WARD                                                       302
MARTIN                                                     303
BLAKE                                                      304
TURNER                                                     305
JAMES                                                      306
14 rows selected.
Elapsed: 00:00:00.01Regards,
Prazy

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